Sand-throwing head for molding machines



'1. s. .TowNsENn.' SAND THRWING HEAD FOR MOLDING MACHINES. APPLlCATION FILED AER. 7, 1920.

LS@ Patented Nov. 21, 1922.

Patented Nov.,` .21, 1222,.

JOHN S. TOVTNSEND, OF HARVEY, ILLINOS, ASSIGLQ'GR TO VJEITING CORPORATION, OF HARVEY, LLNS, A. COROEATIGN OF LLNS.

SAND-THROWING HEAD FOR BOLDNG WLACEIINES.

Application filed April 7, 1920.

To all whom it may concern.' l

Be it lrnown that l, JOHN S. TowNsnND, a citizen of the United States, residing at Harvey, in the county of Cool; and State of Illinois, have invented a certain new and useful Improvement in Sand Throwing Heads for ll/lolding Machines7 of which the following is a specification.

This invention relates to machines for mechanically projecting sand into a mold box containing a pattern from which casting is to be made, 1n such manner that hand ramming is not required in the molding operation.

The object of the invention is to provide a novel form of sand projecting mechanism which is unusually efficient and satisfactory in use.

The invention consists in means for carrying out the foregoing objects which can be easily made and installed, which is highly efficient in operation7 and is not readily liable to get out of order. More particularly the invention consists in feature and details of construction more fully set forth in the specification and claims.

Referring to the drawings in which similar numerals represent" the same parts thruout the several views.

Figure 1 is a side view partially in section of the mechanism illustrating this invention in its preferred form.

Figure 2 is a side view taken on the irregular line 2 2 of Figure 1.

Figure 3 is a reduced size plan view of the mechanism of Figure l.

In carrying out this invention a pair of continuously moving belts l0 and 12 are provided so loc-ated that certain portions 10a and 12l of the belts are located parallel to each other in proximity to each other and together move downward through :a suitable casing 16 open top and bottom. Each belt is provided with a plurality of sand engaging lugs or wings 18 preferably made in the forms shown in the various figures of the drawings and interitting with corresponding wings on the opposite belt. The parts are so arranged that when sand is delivered from the hopper 20 over the portions 10a and 12a f the belts, the sand will not only pass between the belts but will be engaged by the members 18 and pushed downward between the belts to the point of delivery, into the mold or flask (not shown) Serial No, 371,800.

located below the case 1.6. ln practice, the belts are run at such high speed that the wings 18 travel downward faster than the sand moving by gravity only, with the result that the sand is gathered in the spaces formed between adjacent wings 18 on the opposite belts and is delivered from the machine in wads at a greater velocity than that of the sand delivered from the hopper 2U.

Broadly speaking, the mounting of belts 10 and 12 is not material, but in the preferred form of the device with the belts over the pulleys, there is shown a structure which has certain advantages. ln the preferred construction the upper portion of the belt 10 is carried by the pulley mounted upon a shaft 24- joiu'naled in stationary bearings., while they lower end or portion of belt 12 is carried over pulley 25 driven by shaft 28 journaled in fixed bearings. The lower portion of belt 10 passes over a pulley 30 mounted on a shaft 32 iournaled in bearing mechanism 34 carried by lever arm 36 journaled to rock about shaft 21%. Corrcspondinflythe upper 'nor-4 tion of belt 12 is carried on the pulley 38 mounted on a shaft 40 journaled in bearing mechanism 42 carried on a lever arm 44 journaled on shaft 28. There is a lever arm 36 and le on each side if the pulleys referred to, as clearly appears from' an inspection of Figure 3, Each .lever arm 3 is connected to its adjacent lever 44 by a retractile spring 418. The result of the construction described is that the springs 4.8 tend to normally draw pulley 38 and consequently the upper portion of belt 12 yield ingly toward pulley 22 and to correspond ingly draw the lower pulley 30 and the lower portion of belt 'l0 toward pulley 26, This operation results in the belts 10 and 12 being held in normal position shown. lt also provides an opportunity for the belts to separate a substantial distance if a good sized piece of cast iron or other foreign matter happens to be delivered in between the belts and prevents breakage which would otherwise occur.

Shafts 24 and 28 are parallel to each other and one of them, as 24, is driven by power furnished by a source (not shown). The two shafts are connected together thru intermeshing gearing 52 of ordinary construction so arranged that when shaft 24 is rotated all the pulleys and consequently the belts travel in unison with the result that thev portions 10 `and 12a of the belts opposite each other travel downward at uniform speed.

lil'aviiigthus described my invention, what I claim as new and desire to secure by Letters Patent is:

l. In mechanism ot the class described, a pair ot vertically spaced pulleys, a belt over said pulleys, another pair ot vertically spaced pulleys, a belt'over said last mentioned pulleys placed tace to tace with the belt on the first mentioned pulleys, interlittinp; wings on the opposite belts, means for supplying` sand rso that it iialls'in the line occupied. by the opposing tace portions oli said belts, and `means tor driving said pulleys at such a speed that the belts travel :tast enough to gather sand talling' by gravity between belts into wads'and Yto deliver it at a speed greater than gravity, and yieldingmeans inthe mounting' tor said pulleys allowing lateral moyement ot' the belts and pulleys to tale care ot `foreign matter passed between the belts.

2. ln mechanism ol" the class described, an upper pulley journaled in fixed bearings, a lower pulley journaled in a bearing); carried by an arm on theilcaring ol the lirst pulley, a belt over said two pulleys, another belt ot substantially the same size tar-.ing the iirst belt and mounted on two pulleys, one above the other, mounted on axes parallel to the `aves ol the lirst pulleys, a fixed lit-airingfor the sha-ftv oi the lower oli said second two pulleys, an arm extending* upward from said `last mentioned sha-'tt and supporting,r

the bearing ot the upper pulley oit the sccsaid pulleys, another pair ot vertically spaced pulleys, a belt oversaid last mentioned pulleys placed tace to tace with the belt on the rst mentioned pulleys, means for supplying sand so that it falls in the line occupied by the opposing tace portions ot said belts, and yieldingmeans in the mounting for one of said pulleys allowing lateral movement ot the belt which it carries to take care of toreipn-inatter passed between the belts. i

4j In mechanism ot the class described, a pair of vertically spaced pulleys, a beltover said pulleys, `another pair ot vertically spaced pulleys, a belt over said last inentioned `pulleys placed l'li-ace to tace with the belt onthe first mentioned pulleys, means for supplying sand-so that it 'falls in the line `occupied by the opposing` tace-portions ot saidf'belts, yielding means in the mounting tor one ot said pulleys allowing late-ral movement ot' the belt which itcarries to talre care otl foreign matter passed between the belts` and means normally forcing said movable belt toward thc other belt. y

lnmeehanism ot the class described, a pair ot vertically spaced pulleys, a belt over said pulleys, another pair ot vertically spaced pulleys, a belt over said last mention-id pulleys'placedtacefto fliace with the belt Aon the first Vmentioned pulleys, means for supplying` sandf so that it tall s. inthe line occupi-ed by the-opposingf'taceportions ot said belts, vieldinginea'ns inthe mounting; 'l'or one ot said pulleys allowing ylateral movement ot the belt which it carries to take care yot 'foreignmat-ter passed between the belts, and-spr:inp-fmeans normally torcingsaid movable ubelt'towardthe other belt.v

In witness vifhe'reot, Illravexhereunto subscribed myinamein thepre'sence of two witnesses.

JOHN' S.' TOVVNSEND.

`ll'vitnesses:

Dwioirr B. GHEEVER, ANNA' RosENfrHaL. 

